Auxiliary heater for boilers



Jan. 4, .4 R. SCHELIGA AUXILIARY HEATER FOR-BOILERS Filed June 4'. 1925 Patented Jan. 4, 1927..

UNITED STATES IParli-:riff oFFlcE..

RAYMOND scHEL'IGAL or HAWTI-Ionnr., eALrrolmrA.y

AUXILIRY HEATER FOR BOILRS,

Thisinvention relates to improvements in auxiliary heaters for boilers.

' An object of thejinvention is to provide an improved auxiliary heater ofv improved -.5 construction which can be readily applied to boilers of conventional form. In the Aconventional construction and mounting of return tubular boilers, .an arched brick work is employed between the back wall of the mounting and the rear end of the boiler.

This arched brick work frequently becomes burned and requires replacement. The-auxiliary heater is adapted to occupy the position generally occupied by this arched brick 15,worl1; when applied -to a return ltubular boiler. The improved auxiliary heater can be applied to other types of boilers, as will be hereinafter described.

With the foregoing and otherobjects in view which will be made manifest in the following detailed description and specifically pointed out in thel appended claim, refer' ence is had to the accompanying drawings for anillustrative embodiment of tion, wherein:

Figure 1 is a side elevational view illustrating the improved auxillary heaterin ap.--

plied position and as associated withrayreturn tubular boilerof conventional construc- -3 tion, and

Fig.2 is a. transverse sectional view of thel which `are connected by couplings orunions 15, although .any other suitable means for connecting the tubes together can. be employed. As will be noted from Fig. 2, each of the intermediate tubes is so arranged that Vone of its ends or heads is connected to the adjacent tube on one side, and tl opposite yhead is connected to V,the adjacent tube on the opposite side. A conduit 16 is connected to the' other end tube 10. ,It will be readily appreciated that fluid iiow Vfrom the Acon-l the inven- Application led June 4, 1925i Serial No. 35,028.

duit 16 tothe conduit 13`mus't necessarily pass through all vof the tubes 10.

ln Fig. 1 the auxiliary heater is illustrated as mounted upon thev rear wall 17 -of vthe boiler mounting and spans the space beooi tween the rear wall 17 and the rear end 18 p of the boiler. This yspace'is usuallyoccupied .by an arched brickwok which 4is conventional and which must be replaced from time to time, "The conduits 13,and`16 are not illustrated as connected to 'anyparticular part for the reason that they may. be connected'` in several different manners. The` auxiliary heater may be employed as a super-heater in connection with theboiler with the conduit 13 connected to the steam dome ofthe boilerand the conduit 16 leading from the heater to the locationl where the steam is to be used. In such instances the steam passes from the boiler and through the tubes 10,-where it becomes super-heated before passing through the conduit 16. The auxiliary heater can also be employed as a water heater for heating the water before it is admitted to the boiler, in which case either the conduit 13 or 16 can be connected to the` source of watersupply, and-.the other conduit may lead toward the feed, water pump. The auxiliary heater can also. be employed vfor providing an additional steam Space for the boiler, in. which Vinstance the conduit 13.

is connected `to the steam dome orto the steam space within the' boiler and the con.- duit'16 is connected to the Water space within the boiler, thus affording additional interior heating surface for the boiler. be, of course, appreciated thatvthe auxlliary as above disclosed, but may serveoth'ery purposes, if found desirable. ln all events itv will be appreciated that either water or steam occupies the interior of the tubes 1 0.

The hot gases which pass beneath the boiler and then rise between the rear end 18 ,of the boilerand the backwall 17 strike a water or steam cooled metallic surface beforel passing `forwardly through the return tubes in the boiler. lHeretofore when the arched brick work has been employed, the brick work becomes burned in the course of time andgrequires replacement. Furthermore, the heat of the hot gases is lost by the brick work. By' employing the improved Aheater instead of the arch, a water cooled arch is provided,which will not easily burn,

It will `heater is in noway limited to the functions f and which uses or utilizes the heat which has y of the boiler, the auxiliary heater can also heretofore been lost. It will be readily appreciated that by positioningjthe tubes 10 side .by side, ai flame-proof arch or wall is provided. It is notv necessary to otherwise seal the archso formed, but if desired, a coating offire clay, as indicated at 19, may be `applied, so as to prevent any escape of gases or flame between the tubes 10. It is, of course, understood that in the course of time, the under surface of the tubes 10 may Abecome burned. In such cases the tubes may be detached from each other and turned over so as topresent new surfaces which are not burned.

The application of the improved heater is .in no way limited to the particular yconstruction of boiler as shown. It can also be employed in the' re box. of the so-called fire box .boiler and may serve similar functions to those above described'. In such boiler `constructions which have the so-called Dutch ovens located forwardly of the forward end be employed beneath the roof of the Dutch iven to utilizethe heat which is otherwise ost. l

It will be understood that various changes in the detail of construction may be made without departing from the spirityor scope of the invention as defined by the lappended claim. l

I,claim: I An auxiliary heater forboilers comprising large headed tubes ofequal length fitting closely together side by side, L-shaped- `name to this specification.

RAYMOND sensueel. 

